15results about "Ether preparation by compound dehydration" patented technology

A method for producing a (poly)alkylene glycol monoalkyl ether includes reacting an olefin and a (poly)alkylene glycol in a reactor in a presence of a catalyst. The method also includes recovering at least a portion of raw materials used for the production to use the recovered raw materials again as a raw material, where at least one of the recovered raw materials contains an olefin. A mass of a branched olefin relative to a mass sum of the branched olefin and a linear olefin contained in the recovered raw materials is controlled not to exceed 20 mass %.

Methods and systems or devices for synthesis of valuable chemicals from carbon dioxide and hydrogen are provided. A high surface area hollow fiber catalytic membrane reactor such as with hollow fibers coated with a water permeable membrane material is used. The reactor also contains methanol synthesis component, and as needed, a dehydration catalyst component such that the two-step reaction takes place on the catalyst surface. Produced water permeates through the membrane, exiting the reactor immediately after it is formed. Unreacted reactants and products flow to the reactor exit. The valuable chemicals can be liquefied petroleum gas (LPG), dimethyl either (DME), methanol, ethanol, olefin, jet fuel or a combination thereof.

The present disclosure generally relates to the synthesis of an alkoxylated cannabinoid using a double metal cyanide (DMC) catalyst. This procedure affords a novel process for preparing water-dispersible and water-soluble versions of cannabidiol (CBD) and other cannabinoids in high yields through mild reaction conditions.

The present invention discloses SCM-38 molecular sieve, its preparation method and its use. SCM-38 molecular sieve is phosphorus-aluminum or silicon-phosphorus-aluminum molecular sieve. XRD spectrum of SCM-38 molecular sieve shows X-ray diffraction peaks at 2θ of 7.20±0.1, 10.81±0.1, 11.60±0.1, 14.32±0.1, 21.39±0.1, 21.83±0.1, 27.31±0.1 and 28.72±0.1, and has the most intense peak at 2θ of 7.20±0.1. SCM-38 molecular sieve of the present invention can be used in catalyst.

A process for making liquid fuels, especially diesel fuel, from primary alcohols. The process involves subjecting a feedstock comprising primary alcohols to Guerbet coupling to yield a first intermediate mix; subjecting the first intermediate mix to hydrogenolysis to yield a second intermediate mix; and subjecting the second intermediate mix to etherification to yield a liquid fuel suitable for use in internal combustion engines.

This invention discloses a double-helix reactor for producing dimethyl ether, comprising a drying tube, a dimethyl ether synthesis tube, and a methanol synthesis tube. The drying tube and the dimethyl ether synthesis tube are synchronously spirally arranged to form a double-helix structure, with the drying tube positioned above the dimethyl ether synthesis tube. A double-tube contact area is provided at the spiral contact portion between the drying tube and the dimethyl ether synthesis tube. Within this double-tube contact area, the drying tube and the dimethyl ether synthesis tube are in fluid communication. The methanol synthesis gas outlet of the methanol synthesis tube is in fluid communication with the dimethyl ether synthesis reaction gas inlet of the dimethyl ether synthesis tube. This invention can solve the technical problem of easy moisture accumulation in existing dimethyl ether reactors, leading to decreased catalyst activity or even deactivation.

The application is a kind of co-production method based on high-value utilization of whole component of bamboo cane, comprising the following steps: S1, raw material customization supply and pretreatment; S2, flavone extraction and superfine powder preparation; S3, hemicellulose separation and high-carbon powder preparation; S4, multi-path product preparation: path A, material preparation; path B, fuel and chemical preparation; S5, system energy and material circulation. Through the above method, high-purity flavone, bamboo cane superfine residue dry powder, bamboo cane superfine fiber wood dry powder, xylose / syrup, biological resin PLA, bamboo particle raw material, high-purity CO2, dimethyl ether DME, light olefin, benzene, toluene, xylene, green methanol and green aviation kerosene and other products are manufactured. The application realizes the classification and high-value conversion of whole component of bamboo cane, solves the problems of high pretreatment cost and low gasification efficiency, and forms a green circular industrial chain of resources-product-energy.

A process for producing acetic acid comprising: (a) reacting, via a catalytic partial oxidation (CPO) reaction, a CPO reactant mixture in a CPO reactor to produce a hydrogen-lean syngas; wherein the hydrocarbons comprise equal to or greater than about 3 mol% C2+ alkanes; wherein the hydrogen-lean syngas comprises hydrogen, carbon monoxide, carbon dioxide, and unreacted hydrocarbons; and wherein the hydrogen-lean syngas is characterized by a hydrogen to carbon monoxide (H2 / CO) molar ratio of from about 0.7 to about 1.3; (b) feeding at least a portion of the hydrogen-lean syngas and dimethyl ether (DME) to a DME carbonylation unit to produce methyl acetate and a hydrogen-enriched syngas characterized by a H2 / CO molar ratio of from about 1.8 to about 2.2; and (c) feeding at least a portion of the methyl acetate and water to a methyl acetate hydrolysis reaction zone to produce acetic acid and a methanol stream.

The present application relates to the technical field of organic fine chemical industry, in particular to a kind of geranial butyl ether and its preparation method and application.The present application is tri-block copolymer as template agent, tetraethyl orthosilicate is used as silicon source to form mesoporous silica precursor, titanium species is introduced in template retention state, and chloro-trimethylsilane end-capping and decyltrichlorosilane hydrophobic modification are carried out in turn;After template removal, graft 3-mercaptopropyl trimethoxysilane and oxidation, obtain the solid catalyst;The catalyst is used for etherification reaction of geranial and n-butanol, and geranial butyl ether is obtained by vacuum alcohol distillation and vacuum rectification.The present application is conducive to reducing side reaction, improving target product selectivity and improving catalyst cycle stability.

This invention relates to a method for reducing the CO2 emissions produced in the reduction process of iron ore and to improved utilization of off-gases in such an iron-ore reduction process and to an apparatus therefor.

A process for producing hydrocarbons, usable as fuels, from industrial, agroforestry, urban waste and derivatives thereof, with high sustainability and lower CO2 emissions, given the same energy, with respect to the equivalent fuels of fossil origin, by means of a series of subsequent conversions in which first a syngas is produced,, obtained by gasification of waste with oxygen at high temperature, which is purified and adjusted in composition by modulating the H2 / CO ratio and then converted into methanol. The methanol obtained is in turn catalytically converted into light olefins by means of methanol -to- propylene (MTP) technology; such olefins are catalytically converted by oligomerization in order to obtain a hydrocarbon mixture comprising an ultra-light fraction (C1 and C2 ), a light fraction (C3 and C4), a fraction with a boiling range from 60 to 300°C, and a fraction with a boiling temperature above 300°C to be used for product separation and fractionation treatments.

This invention discloses a method for producing acetic acid from lignocellulose raw materials by solvent fractionation. Using non-grain biomass as raw material, the method achieves efficient separation of lignin from cellulose and hemicellulose through pretreatment with hydrogen peroxide-acetic acid aqueous solution. The lignin is then gasified with oxygen and steam to obtain syngas, eliminating the need for a water-gas conversion process. After selectively separating some carbon monoxide, the remaining gas is used to synthesize methanol, which is then dehydrated to obtain dimethyl ether. This dimethyl ether is then reacted with carbon monoxide for carbonylation and hydrolysis to obtain acetic acid and methanol. The methanol and acetic acid are recycled in a closed loop. The molecular sieve used in the carbonylation reaction is modified with alkali and phosphorus to improve the catalyst's lifespan. This method completely eliminates fossil raw materials in the production of acetic acid, resulting in a green and low-carbon chain with high raw material utilization.